Last my XenServer where crashing randomly, we used Auto Support to look if something was wrong but nothing was showed.
After some time looking at the difference between servers that where crashing and those that weren’t crashing I found that within the Smart Array controller I enabled “Write-Cache Battery Override”, after I Disabled this the servers weren’t crashing anymore.
We where having the Smart Array P410i controller with the latest Firmware and XenServer 6.0.2 until Hotfix XS602E016.